Microsoft has added a new theme pack to the Microsoft Store for Windows 10 users. Titled Ice Crystals PREMIUM, the new theme pack contains 15 high-quality 4K wallpapers, the description of which reads as follows:

Etch your desktop with frosty swirls and elaborate patterns in these 15 premium 4k images, free for Windows 10 Themes. These images are to be used as desktop wallpaper only.

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After downloading the collection, go to Start> Settings> Personalization> Themes and click on the theme you prefer.

To apply and change to the most appropriate color, based on the current wallpaper, go to Customize > Colors > Automatically select a primary color from the background.